F91Serious
Miele Refrigerator F91 Error Code
The main and secondary control boards are not communicating properly.
Common causes
- Wiring harness fault
- Connector corrosion
- One of the boards faulty
How to fix it
- Check all connectors on main and secondary boards.
- Look for bent or corroded pins.
- Power down for 10 minutes to reset.
⚠ When to call a pro: If error persists after connector inspection.
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Always unplug the appliance (and turn off the water for washers/dishwashers) before inspecting. These guides are for information only and are not a substitute for a professional repair.